| urgent(adjective, hard, direct, tough, severe) |
| critical(adjective, hard, direct, tough, difficult) |
| imperative(adjective, firm, prompt, important) |
| instant(adjective, direct, prompt, importance) |
| serious(adjective, hard, tough, difficult) |
| crucial(adjective, tough, severe, heavy) |
| exigent(adjective, hard, tough, firm, difficult) |
| vital(adjective, heavy, important, significant) |
| weighty(adjective, hard, tough, severe, difficult) |
| burning(adjective, firm, prompt, energetic) |
| crying(adjective, firm, prompt, important) |
| dire(adjective, firm, prompt, important) |
| significant(adjective, tough, severe, heavy) |
| essential(adjective, important, significant, substantial) |
| importunate(adjective, hard, tough, firm, difficult) |
| momentous(adjective, tough, severe, heavy) |
| earnest(adjective, significant, substantial, valuable) |
| heavy(adjective, tough, severe, heavy) |
| paramount(adjective, direct, prompt, important) |
| ponderous(adjective, severe, harsh, heavy) |